Set ang get methods

[jcm2302]

help i cant get this to work i keep getting null values



//************************************************** ******************
// BookShelf.java Author: James Marshall
//
// Demonstrates the implementation of multiple text fields.
//************************************************** ******************

public class BookShelf
{


public static void main (String[] args)
{

//This is an abstantiated variable//





Book Book1 = new Book ("Java Software Solutions", "Lewis & Loftus", "Addison Wesley", "2009");
Book Book2 = new Book ("Cisco Working at a Small-to-Medium Buisness or ISP", "Allan Reid, Jim Lorenz", "Cisco Press", "2008");

System.out.println (Book1.getTitle());
System.out.println (Book1.getAuthor());
System.out.println (Book1.getPublisher());
System.out.println (Book1.getDate());

System.out.println (Book2.getTitle());
System.out.println (Book2.getAuthor());
System.out.println (Book2.getPublisher());
System.out.println (Book2.getDate());

Book1.setTitle ("Java Software Solutions");
Book1.setAuthor ("Lewis & Loftus");
Book1.setPublisher ("Addison Wesley");
Book1.setDate ("2009");

Book2.setTitle ("Cisco Working at a Small-to-Medium Buisness or ISP");
Book2.setAuthor ("Allan Reid, Jim Lorenz");
Book2.setPublisher ("Cisco Press");
Book2.setDate ("2008");

}
}





//************************************************** ******************
// BookPanel.java Author: James Marshall
//
// Demonstrates the implementation of multiple text fields.
//************************************************** ******************

public class Book
{

private String Title, Author, Publisher, Date;

public Book (String t, String a, String p, String d)
{
}
//String Mutations//

public void setTitle (String t)
{
Title = t;
}

public void setAuthor (String a)
{
Author = a;
}

public void setPublisher (String p)
{
Publisher = p;
}

public void setDate (String d)
{
Date = d;
}

//Return Accessor//

public String getTitle()
{
return Title;
}

public String getAuthor()
{
return Author;
}

public String getPublisher()
{
return Publisher;
}

public String getDate()
{
return Date;
}


public String toString()
{

return "The Title is: " + Title + ",Author is: " + Author + ",Publisher is: " + Publisher + ",Copyright Date is: " + Date;
}
}

any help is appriciated

[Addez]

Idk if it would fix something, cause Idk what is null..
But in your methods, this for example:

public void setDate (String d)
{
Date = d;
}

I think here you set the static Date value to be d.
You must do: this.Data = d; to assign it to the instance Book1 or Book2.
Same goes for your getter methods..